Tripod device with integrated acoustic frequency band filter

Abstract

In a stand device with a fastening unit aligned vertically in the direction of the longitudinal axis, with a first end to which a vibrating body can be detachably attached, and a second end to which a vibratable panel is attached, vibration propagation into a storage surface is minimized by - the panel forms an upper boundary of a resonating body, whereby - in the resonance body below the panel there is arranged a membrane which is mounted so as to be capable of oscillation and to which a predetermined pre-tension can be applied by means of a tensioning device, and wherein - the membrane rests on a plurality of curved sound guide walls which form part of a converter which is designed to at least partially redirect vibrations with horizontally oriented vibration planes applied vertically to the panel by the vibrating body into horizontally propagating vibrations with vertically oriented vibration planes.

Description

The invention relates to a stand device having a fastening unit oriented vertically in the direction of the longitudinal axis, having a first end to which a vibrating body can be releasably attached and a second end to which a vibratable panel is attached.Stand devices of the type mentioned at the beginning are used in the prior art to stably support a body, the vibrating body, vibrating at least in partial regions in a predetermined position and a predetermined distance from a supporting surface. However, the known stand devices all have the disadvantage that vibration energy is dissipated to a large extent from the body via a stand into the surface carrying the stand.As a body vibrating at least in partial areas, it can be formed, for example, by a loudspeaker.DE 2103 702 A discloses an instrument stand having feet formed as profiled rods and consisting of one or more links, retaining members which are articulatedly fastened into the stand head being clamped in and differently dimensioned resonant cavities being formed in the interior of the rods forming the feet, and damping friction elements which are provided with clamping members and transmit clamping forces to the rods being provided between the rods forming the feet.The document DE 2105 234 A discloses a vibration-damped stand, wherein at the end of foot supports, elastically designed surfaces coated with elastic material are used as springs, wherein the foot supports comprise centrally assembled base surfaces consisting of two half parts, and wherein elements consisting of elastic material and enclosing the base surfaces from two sides are provided in a base construction.It is an object of the invention to provide a stand device in which the vibration energy dissipated from a vibrating body via the stand into a surface carrying the stand is minimized.For a tripod device of the type mentioned at the beginning, this object is achieved according to the invention in that the panel forms an upper boundary of a resonant body, wherein a membrane which is mounted in an oscillatory manner is arranged in the resonant body below the panel and onto which a predetermined prestress can be applied by means of a clamping device, and wherein the membrane rests on a plurality of sound-conducting walls which are of curved design and form part of a converter which is designed to deflect oscillations which are applied vertically to the panel by the oscillating body and have horizontally aligned oscillation planes at least partially into horizontally propagating oscillations having vertically aligned oscillation planes.Preferred embodiments of the invention are the subject matter of the subclaims, the elements of which act in the sense of a further improvement of the solution approach of the object on which the invention is based.In the tripod device according to the invention, the combination of features specified above achieves the effect that the oscillations produced by the oscillating body are deflected from a vertical propagation direction in such a way that introduction of oscillation energy into a surface carrying the tripod device according to the invention is minimized.According to a first preferred embodiment of the stand device according to the invention, it is provided that the clamping device generates a predetermined prestress of the diaphragm by means of screws attached to the resonance body. By means of this measure, it is achieved that certain frequency bands of a predeterminable width can be filtered out of a broad frequency spectrum of the waves produced by the vibrating body, both direct object vibrations and sound waves.According to another preferred embodiment of the stand device according to the invention, it is provided that the radius of curvature of the baffles varies logarithmically from the inside to the outside. This achieves a particularly effective suppression of the sound wave propagation in the vertical direction.Preferably, between five and fifteen, in particular twelve, sound conducting walls are provided.According to an important preferred embodiment of the stand device according to the invention, at least one oscillating cone arranged with a tip downwards is provided below the converter, the base surface of which cone opposite the tip is firmly connected to the bottom surface of the converter. This further promotes sound deflection from vertical to horizontal.Preferably, two oscillating cones arranged one below the other are provided.According to a further preferred embodiment of the stand device according to the invention, a plurality of panel-like vibration arresters are arranged perpendicularly adjoining the surface of the at least one vibration cone, one end of which vibration arrester is firmly connected to the surface of the at least one vibration cone and the other end of which vibration arrester is firmly connected to a vibration diverter body which is closed in the direction of the vibration cone and open in the direction away from the vibration cone.A vibration dissipation body is preferably formed by a hollow body, the opening of which is oriented away from the at least one oscillating cone and the wall of which has a planar lower surface for placement on a planar placement surface on which the vibration dissipation bodies are mounted.A vibration dissipation body preferably has an outer edge which is formed in a curved manner, wherein the radius of curvature of the outer edge of a vibration dissipation body changes logarithmically from the inside to the outside according to a further important embodiment of the present invention.Preferably, two to four, in particular three, vibration-diversion bodies are provided.The stand device according to the invention is explained below with reference to a preferred embodiment which is illustrated in the figure of the drawing. Shown therein are: FIG. 1 shows a preferred embodiment of the stand device according to the invention in a side view without vibrating body; FIG. 2 shows a view from below of a preferred embodiment of the stand device according to the invention, which is illustrated in FIG. 1 ; FIG. 3 shows a preferred embodiment of the stand device according to the invention shown in FIG. 1 in a view from above; FIG. 4 shows the oscillating body of the preferred embodiment of the stand device according to the invention shown in FIG. 1 in a side view; FIG. 5 shows a preferred embodiment of the stand device according to the invention shown in FIG. 1 in a side view with a vibrating body.The stand device 100 according to the invention illustrated in FIGS. 1 to 5 has a vertically arranged fastening unit 110, with a first end 111 to which a vibrating body 120 can be releasably attached, and a second end 112 to which a vibratable panel 130 is attached.The panel 130 forms an upper boundary of a resonant body 140, wherein a membrane 150 which is mounted in an oscillatory manner is arranged in the resonant body 140 below the panel 130, to which membrane a predetermined prestress can be applied by means of a clamping device 160, and wherein the membrane 150 rests on a plurality of sound baffles 170 which are of curved design and form part of a converter 175 which is designed to deflect oscillations which are applied by the resonant body 120 vertically to the panel 130 and have horizontally aligned oscillation planes at least partially into horizontally propagating oscillations having vertically aligned oscillation planes.The tensioner 160 generates a predetermined bias of the diaphragm 150 by screws attached to the resonator body 140 for the purpose of generating a predetermined band filter characteristic.The radius of curvature of the baffles 170 varies logarithmically from the inside to the outside, wherein a total of twelve baffles 170 are provided.Below the converter 175, two oscillating cones 180 are provided, each of which is arranged with the tip 181 downwards, wherein a base surface 182 of an upper one of the two oscillating cones 180 opposite the tip 181 is firmly connected to the bottom surface of the converter 175.Arranged perpendicularly to the respective surface of the two oscillating cones 180 are a plurality of panel-like oscillation arresters 190, each of whose one end 191 is fixedly connected to a part of the surface of an oscillating cone 180, and whose other end 192 is fixedly connected to a vibration diverting body 200 which is closed in the direction of the oscillating cone 180 and is open in the direction away from the oscillating cone 180.A vibration dissipation body 200 is formed by a hollow body, the opening 201 of which is oriented away from the at least one oscillating cone 180 and the wall 202 of which has a planar lower surface for placement on a planar placement surface on which the vibration dissipation bodies 200 are mounted.A vibration dissipation body 200 is provided with an outer edge 203 formed in a curved manner, wherein the radius of curvature of a respective outer edge 203 of a vibration dissipation body 200 changes logarithmically from the inside to the outside.According to the illustrated exemplary embodiment, three vibration dissipation bodies 200 are provided.The exemplary embodiment of the invention explained above serves only for the purpose of a better understanding of the teaching according to the invention specified by the claims, which as such is not restricted by the exemplary embodiment.List of reference characters100 Tripod device 110 Fastening unit 111 First end 112 Second end 120 Vibrating body 130 Panel 140 Resonant body 150 Diaphragm 160 Clamping device 170 Sound-conducting wall 175 Converter 180 Vibrating cone 181 Tip of the vibrating cone 182 Base surface of the vibrating cone 190 Vibration arrester 191 First end of a vibration arrester 192 Second end of a vibration arrester 200 Vibration-diverting body 201 Opening 202 Wall 203 Outer edge

Claims

Stand device (100) having a fastening unit (110) oriented vertically in the direction of the longitudinal axis, having a first end (111), to which a vibrating body (120) can be releasably attached, and a second end (112), to which a vibratable panel (130) is attached, characterized in that - the panel (130) forms an upper boundary of a resonant body (140), wherein - a membrane (150), which is mounted in a vibratable manner and to which a predetermined prestress can be applied by means of a clamping device (160), is arranged in the resonant body (140) below the panel (130), and wherein - the membrane (150) rests on a plurality of sound-conducting walls (170), which are of curved design and form part of a converter (175) which is configured, in order to deflect oscillations applied vertically by the oscillation body (120) to the panel (130) with horizontally oriented oscillation planes at least partially into horizontally propagating oscillations with vertically oriented oscillation planes.Tripod device according to claim 1, characterised in that the clamping device (160) generates a predetermined prestress of the membrane (150) by means of screws (161) attached to the resonance body (140).Stand device according to one of the preceding claims, characterized in that the radius of curvature of the sound-conducting walls (170) varies logarithmically from the inside to the outside.Stand device according to one of the preceding claims, characterized in that between five and fifteen sound guide walls (170) are provided.Stand device according to one of the preceding claims, characterized in that twelve sound guide walls (170) are provided.Stand device according to one of the preceding claims, characterized in that below the converter at least one oscillating cone (180) is provided which is arranged with a tip downwards and the base surface (182) of which, opposite the tip (181), is fixedly connected to the bottom surface of the converter (175).Stand device according to claim 6, characterised in that two oscillating cones (180) arranged one below the other are provided.Tripod device according to one of the preceding claims, characterized in that a plurality of vibration arresters (190) of panel-like design are arranged perpendicularly adjoining the surface of the at least one vibration cone (180), one end (191) of which is fixedly connected to the surface of the at least one vibration cone (180) and the other end (191) of which is fixedly connected to a vibration diverting body (200) which is closed in the direction of the vibration cone (180) and open in the direction away from the vibration cone (180).Tripod device according to claim 8, characterised in that a vibration dissipation body (200) is formed by a hollow body, the opening (201) of which is oriented away from the at least one oscillating cone (180) and the wall (202) of which has a planar lower surface for placement on a planar placement surface on which the vibration dissipation bodies (200) are mounted.Stand device according to claim 9, characterised in that a vibration deflection body (200) is provided with an outer edge (203) formed in a curved manner.Stand device according to claim 10, characterised in that the radius of curvature of the outer edge (203) of a vibration deflection body (200) changes logarithmically from the inside to the outside.Stand device according to one of Claims 8 to 11, characterized in that two to four vibration deflection bodies (200) are provided.Stand device according to one of Claims 8 to 11, characterized in that three vibration-deflecting bodies (200) are provided.

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